Discord.js TypeError：无法读取未定义的属性“前缀”

Question

我收到以下错误...

Error: connect ECONNREFUSED 127.0.0.1:5432
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16)
(node:8232) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'prefix' of undefined

当使用来自我的机器人的命令时。我认为问题出在机器人的主文件上。 以下代码块是我认为错误的来源。

function startsWithPrefix(str, prefix) { if (str.slice(0, prefix.length).toLowerCase() == prefix.toLowerCase()) return true; }



// Execute when the bot sees a message
client.on('message', async msg => {
    // Initialize guild settings on first message
    if (msg.guild && !Settings[msg.guild.id]) {
        const pool = new Pool();
        try {
            const res = await pool.query('SELECT prefix FROM settings WHERE guild_id = $1', [msg.guild.id]);
            if (res.rows[0]) { Settings[msg.guild.id] = res.rows[0]; }
            else {
                Settings[msg.guild.id] = {
                    prefix: 'a!' // Default setting
                };
            }
        } catch (err) { console.log(err.stack); }
        finally { pool.end(); }
    }
    // Exit if msg doesn't start with prefix
    if (msg.guild && !startsWithPrefix(msg.content, Settings[msg.guild.id].prefix)) { return; }
    // Exit if msg was sent by a bot
    if (msg.author.bot) { return; }
    // Exit + Reply with a helpful message if msg was dm-ed to this bot
    if (msg.channel.type == 'dm') { return await msg.reply(`I got nothin' for ya buddy :pensive:\nI think you meant to type that in the **Among Us LFG** server :+1:`); }


    // Separate the command from the arguments
    const words = msg.content.split(' ');
    const cmdName = words[0].toLowerCase().slice(Settings[msg.guild.id].prefix.length);
    const cmd = client.cmds.get(cmdName) || client.cmds.get(client.aliases.get(cmdName));
    const args = words.slice(1);

    // Run the command
    if (cmd) cmd.run(client, msg, args);
});

// Start the bot
client.login(discordToken);

编辑：似乎 Settings[msg.guild.id] 未定义，但我将其定义为

let Settings = {};
exports.Settings = Settings;

在代码的开头不知道有什么问题

Answer 1

我认为您可以尝试使用这样的 const 定义前缀：

const prefix = '!'